/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package br.com.caelum.vraptor.interceptor;
import static com.google.common.base.Preconditions.checkArgument;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import javax.inject.Inject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import br.com.caelum.vraptor.HeaderParam;
import br.com.caelum.vraptor.InterceptionException;
import br.com.caelum.vraptor.Intercepts;
import br.com.caelum.vraptor.controller.ControllerMethod;
import br.com.caelum.vraptor.core.InterceptorStack;
import br.com.caelum.vraptor.core.MethodInfo;
import br.com.caelum.vraptor.http.MutableRequest;
import br.com.caelum.vraptor.http.Parameter;
import br.com.caelum.vraptor.http.ParameterNameProvider;
import br.com.caelum.vraptor.http.ParametersProvider;
import br.com.caelum.vraptor.validator.Message;
import br.com.caelum.vraptor.validator.Validator;
import br.com.caelum.vraptor.view.FlashScope;
/**
* An interceptor which instantiates parameters and provide them to the stack.
*
* @author Guilherme Silveira
*/
@Intercepts(after=ControllerLookupInterceptor.class)
public class ParametersInstantiatorInterceptor implements Interceptor {
private static final Logger logger = LoggerFactory.getLogger(ParametersInstantiatorInterceptor.class);
private final ParametersProvider provider;
private final ParameterNameProvider parameterNameProvider;
private final MethodInfo parameters;
private final Validator validator;
private final MutableRequest request;
private final FlashScope flash;
private final List<Message> errors = new ArrayList<>();
/**
* @deprecated CDI eyes only
*/
protected ParametersInstantiatorInterceptor() {
this(null, null, null, null, null, null);
}
@Inject
public ParametersInstantiatorInterceptor(ParametersProvider provider, ParameterNameProvider parameterNameProvider, MethodInfo parameters,
Validator validator, MutableRequest request, FlashScope flash) {
this.provider = provider;
this.parameterNameProvider = parameterNameProvider;
this.parameters = parameters;
this.validator = validator;
this.request = request;
this.flash = flash;
}
@Override
public boolean accepts(ControllerMethod method) {
return method.getMethod().getParameterTypes().length > 0;
}
@Override
public void intercept(InterceptorStack stack, ControllerMethod method, Object controllerInstance) throws InterceptionException {
Enumeration<String> names = request.getParameterNames();
while (names.hasMoreElements()) {
fixParameter(names.nextElement());
}
addHeaderParametersToAttribute(method);
Object[] values = getParametersFor(method);
validator.addAll(errors);
logger.debug("Conversion errors: {}", errors);
logger.debug("Parameter values for {} are {}", method, values);
parameters.setParameters(values);
stack.next(method, controllerInstance);
}
private void addHeaderParametersToAttribute(ControllerMethod controllerMethod) {
for (Parameter param : parameterNameProvider.parametersFor(controllerMethod.getMethod())) {
HeaderParam headerParam = param.getAnnotation(HeaderParam.class);
if (headerParam != null) {
String value = request.getHeader(headerParam.value());
request.setParameter(param.getName(), value);
}
}
}
private void fixParameter(String name) {
checkArgument(!name.contains(".class."), "Bug Exploit Attempt with parameter: %s", name);
if (name.contains("[]")) {
String[] values = request.getParameterValues(name);
for (int i = 0; i < values.length; i++) {
request.setParameter(name.replace("[]", "[" + i + "]"), values[i]);
}
}
}
private Object[] getParametersFor(ControllerMethod method) {
Object[] args = flash.consumeParameters(method);
if (args == null) {
return provider.getParametersFor(method, errors);
}
return args;
}
}